Electrical discharge device



June 6, 1933. M. A. ACHESON ELECTRICAL DISCHARGE DEVICE Filed May 19, 1928 Fig. I.

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Inventor TTlarcus A.Acheson,

0%. His Attorney.

Patented June 6, 1933 7 -EP T PATENT OFFICE Memos A. AcnnsoN,

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j EECTRICAL nrscnnnennnvrcn Application s mm 19,

The present invention relates toelectrical discharge devices which are intended to be operated at high impressed voltages- Such devices usually consist of a water cooled anode, a glass tube or sleeve sealed thereto and other parts. The glass portion of such a device frequently becomes overheated and, unless means are taken to prevent it, the seal between the glass and metal portions is apt to be punctured due either to arcing between the different electrodes or to corona discharge. It is one of theobjects of my invention to provide means wherebythe glass tube in a device of this character may be efliciently 15 cooled and the seal adequately shielded both from are and corona discharge. i r

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims.

The invention itself,however, will best be understoodfrom reference to the following specification when considered in connection with the accompanyingdrawing in which Fig. 1 shows aview partly in section and partly in elevation of a discharge device whichlembodies the features of the present invention; while Fig. 2 is a detailed view on an enlarged scale of the water-cooled anode and shielding means. i

a receptacle consisting ofa glass tube or sleeve 1 which is sealed toa copper anode 2 at the point 3. Leads 4 and 5 supply current to the cathode electrode, while lead 6 supplies a potential to the grid or control electrode.

The anode is provided with a flange 7 and is adapted to be inserted into a water jacket of the type described in my copending application Serial No. 192,429, filed May 16, 1927.

" This jacket comprises an outer cylindrical member 9 and has a collar 10 at its upper end. The collar is provided with four brackets each of which consists of two members 11 pivoted at their lower ends on a rod 11 and connected rigidly together by a plate 12.

The upper ends of the members 11 are connected together by a rod 12 on which an angular member '13 is pivoted, the upper end of member 13 being adapted to engage the flange 7 of the anode 2. The pivoted mem- The device shown in the drawing comprises 1928. Serial in). 279,120.

bers 13 are provided with screw-threaded is provided with an inner concentric meml ber 15 which is flexibly secured to the base 16 of the jacket by anexpansible metal ring member 17 t To remove the discharge device from the water jacket the base portion of the jacketis provided with a metal block 18 having a' longitudinally movable part 19 extending through an opening 20' in base 16 and adapted to engage the lower end of the discharge device. An eccentric member 21 is rotatably mounted in the member 19 and secured toa shaft 22yso that rotation of thelatterforces member 19 upwardly into engagement with the anode andthus forces the discharge device partly out of the waterjacket. The water jacket is surrounded by a con centric metallic casing 23 which is spaced from the water jacket and provided with flanges or metal spiders 2 1 and 25 adjacent its upper and lower ends. The waterjacket is supplied with apair of flanges 26 and 27 which are located between and adjacent to the flanges 24 and 25 respectively. Springs 28 and 29 are mounted between the adjacent flanges on the casingand water jacketand serve to flexibly support the discharge device on the casing. The upper end of the casiiigis enlarged as indicated at 30 and con-v tracted atpoint 31 which is slightly beyond the seal between the glass tube 1 and metal anode 2. The upper edge of the casing 23 is curved outwardly as clearlyindicated in thedrawing.

i The casing is supported from abase mem-Q To GENERAL rinnc'rmc 1 COMPANY, A CORPORATION OFNEW YORK i electrodes of the device.

A steel angle-iron 35 secured to the casing and cap 33 retains the casing in position.

A rubber hose 36 is wound around the base portion 32 and connected at 37 and 38 to the inner and outer portions of the water jacket so that cooling fluid will enter at 37 and flow over the top of the inner member 15 and out at the point 38.

The base'32 also has an opening 39 through which compressed air may be blown. The air flows upwardly through the casing 23 and the upper end of the casing acts as an air nozzle and directs the compressed cooling air along the outer surface of the glass tube and maintains the latter at a desired relatively low temperature.

The'casing 23 is electrically connected to the anode through the water jacket and not only serves as an air nozzle to cool the glass portion of the sleeve but also serves to shield the seal between the glass tube and anode from corona and are discharges between the Although I have shown an air inlet at the point 39, such a location is not essential and the air inlet may, if desired, be located at any point in the easing 23 below the contracted portion 31 thereof lVhat I claim as new and desire to secure by Letters Patent of the United States, is:

1. An electric discharge device comprising a vitreous tube and a hollow metal electrode sealed to said tube, a hollow metal electric discharge shield located externally to and spaced from said discharge device and electrically connected to said electrode, said shield having an open end and extending beyond the junction of said tube and electrode, and means whereby air may be supplied to the space between said shield and electrode and directed through the open end onto the vitreous tube over substantially the entire length.

2. An electric discharge device comprising a vitreous tube and a hollow metal anode sealed to one end of the tube, av hollow metal electric discharge shield surrounding said anode and electrically connected to the anode, said shield having a curved surface at one end thereof opposite the vitreous tube, and means whereby air may be directed through said shield and onto the surface of said tube over substantially the entire length.

3. An electric discharge device comprising a container having a glass member and a metal member sealed thereto, the latter member constituting one of the electrodes of the discharge device, a casing surrounding and spaced from said metal member and projecting beyond the junction of said glass and metal members, said casing having an out- Wardly curved upper end portion constituting an electrostatic shield and having an open end, means whereby air may be dithe discharge device, a casing surrounding and spaced from said metal member and extending beyond the junction between said -m'etal and glass -members, said casing hav ing'an open end and serving as an electric discharge shielding member for said junction and as an air nozzle whereby air may be directed. through the open end along the surface of said glass tube over substantially the entire length.

5. An electric discharge device comprising a container having a glass member and a metal member sealed thereto, the metai member constituting one of the electrodes of the device, a jacket surrounding and supporting said metal member, means whereby a cooling fluid may be supplied to the jacket, and a casing supporting said jacket and electrically connected to said electrode, said casing being spaced from the jacket and extending beyond the junction of the metal and glass members, the upper end of said casing having an outwardly curved surface.

6. An. electric discharge device comprising a container having a glass member and a metal, member sealed thereto, the metal member constituting one of the electrodes of the device, a acket surrounding and supporting said metal member, means whereby a cooling fluid may be supplied to the jacket, a casing supporting said jacket and electrically connected to said electrode, said casing being spaced from the jacket and extending beyond the junction of the metal and glass members, the upper end of said casing having an outwardly curved surface, and means whereby air may be forced through said casing and onto said glass member.

In witness whereof, I have hereunto set my hand this 18th day of May, 1928.

MARCUS A. ACHESON. 

